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author | Marek Polacek <polacek@redhat.com> | 2023-06-22 16:56:26 -0400 |
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committer | Marek Polacek <polacek@redhat.com> | 2023-06-23 16:46:29 -0400 |
commit | 5388a43f6a3f348929292998bd6d0c1da6f006de (patch) | |
tree | dcc504a25f4e8ac3aedc9274918abc05d37f6984 /gcc/doc | |
parent | b7fc0a3be52f78100a270b63e7555fde078fd2e3 (diff) | |
download | gcc-5388a43f6a3f348929292998bd6d0c1da6f006de.zip gcc-5388a43f6a3f348929292998bd6d0c1da6f006de.tar.gz gcc-5388a43f6a3f348929292998bd6d0c1da6f006de.tar.bz2 |
c++: Add support for -std={c,gnu}++2{c,6}
It seems prudent to add C++26 now that the first C++26 papers have been
approved. I followed commit r11-6920 as well as r8-3237.
Since C++23 is essentially finished and its __cplusplus value has
settled to 202302L, I've updated cpp_init_builtins and marked
-std=c++2b Undocumented and made -std=c++23 no longer Undocumented.
As for __cplusplus, I've chosen 202400L:
$ xg++ -std=c++26 -dM -E -x c++ - < /dev/null | grep cplusplus
#define __cplusplus 202400L
I've verified the patch with a simple test, exercising the new
directives. Don't forget to update your GXX_TESTSUITE_STDS!
This patch does not add -Wc++26-extensions.
gcc/c-family/ChangeLog:
* c-common.h (cxx_dialect): Add cxx26 as a dialect.
* c-opts.cc (set_std_cxx26): New.
(c_common_handle_option): Set options when -std={c,gnu}++2{c,6} is
enabled.
(c_common_post_options): Adjust comments.
* c.opt: Add options for -std=c++26, std=c++2c, -std=gnu++26,
and -std=gnu++2c.
(std=c++2b): Mark as Undocumented.
(std=c++23): No longer Undocumented.
gcc/ChangeLog:
* doc/cpp.texi (__cplusplus): Document value for -std=c++26 and
-std=gnu++26. Document that for C++23, its value is 202302L.
* doc/invoke.texi: Document -std=c++26 and -std=gnu++26.
* dwarf2out.cc (highest_c_language): Handle GNU C++26.
(gen_compile_unit_die): Likewise.
libcpp/ChangeLog:
* include/cpplib.h (c_lang): Add CXX26 and GNUCXX26.
* init.cc (lang_defaults): Add rows for CXX26 and GNUCXX26.
(cpp_init_builtins): Set __cplusplus to 202400L for C++26.
Set __cplusplus to 202302L for C++23.
gcc/testsuite/ChangeLog:
* lib/target-supports.exp (check_effective_target_c++23): Return
1 also if check_effective_target_c++26.
(check_effective_target_c++23_down): New.
(check_effective_target_c++26_only): New.
(check_effective_target_c++26): New.
* g++.dg/cpp23/cplusplus.C: Adjust expected value.
* g++.dg/cpp26/cplusplus.C: New test.
Diffstat (limited to 'gcc/doc')
-rw-r--r-- | gcc/doc/cpp.texi | 7 | ||||
-rw-r--r-- | gcc/doc/invoke.texi | 12 |
2 files changed, 16 insertions, 3 deletions
diff --git a/gcc/doc/cpp.texi b/gcc/doc/cpp.texi index b0a2ce3..3f492b3 100644 --- a/gcc/doc/cpp.texi +++ b/gcc/doc/cpp.texi @@ -1908,9 +1908,10 @@ selected, the value of the macro is @code{201402L} for the 2014 C++ standard, @code{201703L} for the 2017 C++ standard, @code{202002L} for the 2020 C++ standard, -or an unspecified value strictly larger than @code{202002L} for the -experimental languages enabled by @option{-std=c++23} and -@option{-std=gnu++23}. +@code{202302L} for the 2023 C++ standard, +or an unspecified value strictly larger than @code{202302L} for the +experimental languages enabled by @option{-std=c++26} and +@option{-std=gnu++26}. @item __OBJC__ This macro is defined, with value 1, when the Objective-C compiler is in diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index fd4943b..efcf3bf 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -2507,6 +2507,18 @@ change in incompatible ways in future releases. GNU dialect of @option{-std=c++2b}. Support is highly experimental, and will almost certainly change in incompatible ways in future releases. + +@item c++2c +@itemx c++26 +The next revision of the ISO C++ standard, planned for +2026. Support is highly experimental, and will almost certainly +change in incompatible ways in future releases. + +@item gnu++2c +@itemx gnu++26 +GNU dialect of @option{-std=c++2c}. Support is highly experimental, +and will almost certainly change in incompatible ways in future +releases. @end table @opindex aux-info |